I got this link from hobag who got it from some source that I forgot. (oops). This article though goes through a few jobs and a few "tricks" that each profession uses. For example: those balloon animal makers don't tell the kids what they make and let the kids use their imagination. There's a lot of jobs there and some are pretty interesting. BTW - I'm not sure if this is a joke or not because some of them sound very real and some of them are obviously jokes.

When taking family portraits that include a dog, don’t use the dog’s name or say “doggie, doggie” to get its attention, because it might trot over to you. Instead, call out “kitty, kitty, kitty.” The dog will perk up and look around for a cat, and you can get a great shot if you time it right.